Electromagnet.



0. M. GLUNT.

ELECROMAGNET. APPLICATIGH 4FILED JUNE 22, 1917.

1,291,831, mental 5m. 21,1925

UNITED sTATEs PATENT oEEioE.

OMER M. GLUNT, OF RUTHERFORD, NEW' JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ELECTROMAGNET.

Specification of Letters Patent.

Patented Jan. 21, 1919.

Application filed June 22, 1917. Serial No. 176,381.

To all whom it may concern.'

Beit known that I, OMER M. GLUNT, a citizen of the United States, residing at Rutherford, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in Electromagnets, of which the following is a full, clear, concise, and exact description.

This invention relates to electromagnets and more particularly to an improved method for supporting the armature of an electromagnet.

The object of Ithis invention is to provide a structure eiiicient in operation, and cheap to manufacture and assemble, and one in which the adjustment of the armature with respect to the pole pieces is easily obtained and remains permanent in service.

To attain this object, in accordance with a feaiture of the invention, the ends of the cores are recessed to receive steel rings which are snapped into place during assembly and provide shoulder portions against which the yoke and armature bridge are securely held by means of an adjusting screw.

This and other features of the invention may be more clearly understood by reference to the accompanying drawing, in which Figure 1 is a view partially in section of a structure embodying the invention as applied to a telephone ringer; and Fig. 2 is an expanded view showing the various parts of Fig. 1 separated and in position for assembling. For the sake of simplicity, the gongs and upper portion of the ringer are not shown in the drawing since they form no part of the present invention.

The magnet spools 3, 3 each provided with a core 4 of magnetic material are oined by a suitable yoke 5 of a non-magnetic material. This yoke is provided with perforations 6, 6 of suitable dimensions to lit over the cores and is held in place by the steel rings 7 7 which during assembly are snapped into the grooves 8, 8v provided in the cores. The armature 9 to which is attached the well-known form of clapper rod 10, is pivotally mounted to right-angle extensions of the armature bridge 11 of brass or other non-magnetic material. The ends of the bridge 11 are U-shaped, or, in other words, the ends are bent back toward each other, and are provided with perforations 12, 12 adapted to lit over the ends of the cores. The adjustment of the armature 9 with respect to the ends of the cores L1, 11

is obtained by means of the adjusting screw 13 which extends through the perforation 11 in the armature bridge 11 and the perforation 15 in the arma-ture 9, and engages threads in the embossed hole 16 in the yoke 5. yThe head of the screw shoulders aga-inst the countersunk portion of perforation 14, hence as the screw is turned the yoke 5 and the ends of bridge 11 are drawn against the rings 7, 7, thereby holding the various parts securely in place. Further turning of the screw 13 results in iieXing *the armature bridge 11 and allowing the armature to approach the ends of the cores, thereby providing a simple means of adjustment. A perforation 17 is provided in the magnet 18 toV permit the use of a screw driver to easily change the adjustment of the ringer.

In the structure as described, it will be noted that it is not necessary to restrict the cross-section of the core an appreciable amount to afford means for mounting the armature and its support. Practically the entire cross-section of the core is therefore effective, resulting in an eiiicient magnetic circuit and insuring a higher impedance to a winding of a given number of turns; this high impedance in turn resulting in a lower shunting effect on high frequency voice currents. The manner of flexing the armature bridge in which the ends are bent back at an angle of 180o permits a. greater effective length to this part, thereby affording a more sensitive adjustment on account of the greater resiliency of the armature bridge and also lessens the possibility of the metal taking a permanent set.

What is claimed is:

1. In an electromagnet, the combination of a pair of cores having grooves therein, an armature bridge engaging said cores, a yoke extending between said cores and nonadjustable means coperating with said grooves to provide an abutting member whereby said yoke and the ends of said armature bridgeare held in a fixed position with respect to said cores.

2. In an electromagnet, the combination of a pair of cores having grooves therein, an armature bridge engaging said cores, a yoke extending between said cores and spring rings coperating with said grooves to provide an abutting member whereby said yoke and the ends of said armature bridge are .held in a fixed position with respect to said cores.

3. In an electroniagnet, the combination of a pair of cores having grooves therein, an armature bridge having its opposite ends bent toward each other to engage said cores, and spring rings coperating With said grooves to position said armature bridge With respect to said cores.

l 4. In an electromagnet, the combination of arpa-ir of cores having groovesv therein, a yoke interconnecting said cores, and locatedon one side of the grooves, anv armature bridge located on the other side of said grooves, and means independent of said yoke cooperating With said grooves to hold said yoke and the ends of said armatureA bridge in a fixed position. l

5. In an electromagnet, thev combi-nationof a pair of cores having grooves therein, a

Yoke extendingl between said cores andlocated on one side of the grooves, an armature bridge engaging said cores, .and located on the otherside of's'aid. cores, meanscop erating With said grooves to position said yoke and bridge with respect to said cores, and additional means for holding said yoke and armature bridged in locked engagement With said rst means.

6. In an electromagnet, the combination of a pair of cores having grooves therein, a yoke extending between saidfcores, an' armature bridge engaging said cores, an armature pivotallyV mounted in saidv bridge,Y

spring rings coperating with said' grooves` to provide' an abutting' member; forV said bridge and yoke, and means for eXingfsai-d bridge to determine the position of said'ar'- mature relative'to said cores. l l

In witness whereof, I hereuntol sirbscribe my name this 18th day'of Jn'e, A. vD.- 1917'.V

Y OMER Mi GLUNT Copies of this patent may be obtained for fivecents each, by addressing the Goinmissonet1f-Patenti, Washington, `I). 01.. 

